Raspberry pi 4, display LE to 2nd hdmi port

loek6000 · April 29, 2020 at 8:37 AM

Hi there

I would like to display LE from the 2nd hdmi, now it is the 1st and LE wont clone displays...

Why? Because i have the RP near to my computer with 1 hdmi cable and the other cable goes to tv a few meters apart.

I would like to work with diverent os's on the RP and through the main hdmi port to my computer monitor. Now i have to attach the main hdmi cable (1) to the main on the RP to be able to see movies... If i want to work with different os's i have to switch the cables, which i have to do very often.

Is there a way to select the hdmi port through config.txt so i can choose which hdmi port to display from when launching LE?

**Da Flex** · April 29, 2020 at 8:47 PM Official Post

Using the second HDMI port (HDMI1) is work in progress. I found this config.txt to enable both ports. Give it a shot.

loek6000 · April 29, 2020 at 9:52 PM

ok thanx but i dont have to use the whole script do i? i see people having trouble when they do so..... maybe some lines which refer to hdmi?

**Da Flex** · April 29, 2020 at 10:07 PM Official Post

Every line containing :1 should be related to the second port, like hdmi_group:1=2. hdmi_safe=1 seems to be important, too, but I can't test it on my RPi 3B+.

loek6000 · April 29, 2020 at 10:33 PM

aha ok, well i am a rp starter, so i have alot to learn..... the script you were refering to delivers a black screen on the 2nd port

the only thing i want is to output through hdmi 1 (2nd port) so i can use hdmi 0 for other os's and i dont need to swap the cables repeatly

**Da Flex** · April 30, 2020 at 12:09 AM Official Post

I haven't found a solution that does HDMI0 -> HDMI1 on-the-fly. Using config.txt at boot time seems to be the only software option.

We don't call it a script, config.txt is a configuration file.

The config.txt of the link starts with arm_freq=1500 and ends with hdmi_pixel_freq_limit:1=0x11e1a300. Copy that part into your own config.txt.

If it has no effect, I can only suggest a hardware solution, which is an HDMI switch.

loek6000 · April 30, 2020 at 8:37 AM

Ok thanx, i already did that yesterday and just a few minutes ago, but with the same result : black screen on the 2nd screen...

what i can say that it is doing something, because the default config.txt displays a coloured screen on the 2nd display

**Iridium** · April 30, 2020 at 5:02 PM Official Post

If I understand you correctly, you have one RPi and 2 screens. You want the output to go to one or the other depending on the OS being used.

If so, your simplest solution would be to buy a HDMI splitter - making sure it supports one in two out - and use that switch to switch displays.

**Da Flex** · April 30, 2020 at 5:43 PM Official Post

After some more reading it looks like HDMI-1 depends on an active HDMI-0. Just for testing, start your RPi with both screens connected.

If it turns out that this dependency is true (do an extra research to be sure), you have to buy an HDMI switch to do what you want.

loek6000 · April 30, 2020 at 7:28 PM

Iridium indead, you understood correctly and yes, i already search for several splitters and switches, splitters can stream over MAX 3 meters, while powered switches can do a bigger distance

Da Flex , yep you are right

thanx all, i now know what i have to do

Raspberry pi 4, display LE to 2nd hdmi port

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